Update .ai/models.md

Co-authored-by: dg845 <58458699+dg845@users.noreply.github.com>

Author: yiyixuxu

.ai/models.md

@@ -17,7 +17,7 @@ Linked from `AGENTS.md`, `skills/model-integration/SKILL.md`, and `review-rules.
 
 ## Single-file model layout
 
-A model follows the **single-file policy**: its full implementation lives in one `transformer_<name>.py` (or `unet_<name>.py`) — attention (the `Attention` class and its processor), transformer blocks, RoPE, and any model-specific layers all in that file.
+A model follows the **single-file policy**: its full implementation lives in one `transformer_<name>.py` (or `unet_<name>.py`) — attention (the `Attention` class and its processor), transformer blocks, RoPE, and any model-specific layers should all be in that file.
 
 For shared building blocks, either:
 - **import** a common layer from `normalization.py`, `attention.py`, or `embeddings.py`, or